A tough Conjuerer Misiosn..with two main foes

[Enkidoh]

Another thing to remember about that story quest is you're not actually expected to win the battle on your own - all you have to do is drag the gargoyle's HP to about a quarter left, and then a certain npc or npcs will run in and quickly finish off the gargoyle for you - the masked mage won't last long after that.

But yes, fighting it as CNJ is pretty challenging, but not impossible - basically, keep Protect up, and then alternate between Aero, Stone, Cure, Aero, Stone, Cure etc. Having an ether on your hotbar would also greatly help. When the boss uses it's poison attack, remove it also with Esuna or an antidote placed on your hotbar as this will gradually wear your HP down dangerously, making it's removal imperative.

Really though, it's not so much a hard battle as more one that teaches you how every boss fight has a simple strategy to it, that once realized, makes the battle simple. Good luck!